I-15 weather conditions near Sweet Grass, Montana

Roadnow AI Agent Live Update

7 day weather forecast

• Today 2025-12-03, Mostly Sunny. Mostly sunny, with a high near 28. South southwest wind 8 to 10 mph.
• Tonight 2025-12-03, Partly Cloudy. Partly cloudy, with a temperature falling to near 18 by 11pm, then rising to around 26 during the remainder of the night. West wind 10 to 14 mph, with gusts as high as 20 mph.
• Thursday 2025-12-04, Mostly Cloudy. Mostly cloudy, with a high near 34. West wind 11 to 14 mph, with gusts as high as 23 mph.
• Thursday Night 2025-12-04, Mostly Cloudy. Mostly cloudy, with a low around 16. West wind 10 to 13 mph, with gusts as high as 20 mph.
• Friday 2025-12-05, Chance Snow. A 30 percent chance of snow after 11am. Mostly cloudy, with a high near 31. West northwest wind 6 to 10 mph becoming south southwest in the morning. New snow accumulation of less than a half inch possible.
• Friday Night 2025-12-05, Chance Snow. A 50 percent chance of snow. Mostly cloudy, with a low around 9. South southwest wind 8 to 10 mph. New snow accumulation of less than a half inch possible.
• Saturday 2025-12-06, Slight Chance Snow then Partly Sunny. A 20 percent chance of snow before 11am. Partly sunny, with a high near 25. South southwest wind 7 to 9 mph.
• Saturday Night 2025-12-06, Partly Cloudy. Partly cloudy, with a low around 12. West southwest wind around 10 mph.
• Sunday 2025-12-07, Partly Sunny. Partly sunny, with a high near 36.
• Sunday Night 2025-12-07, Partly Cloudy. Partly cloudy, with a low around 24.
• Monday 2025-12-08, Mostly Sunny. Mostly sunny, with a high near 37.
• Monday Night 2025-12-08, Mostly Cloudy. Mostly cloudy, with a low around 27.
• Tuesday 2025-12-09, Chance Rain/Snow. A chance of rain and snow. Mostly cloudy, with a high near 42.